针对垃圾焚烧炉参数优化优先级设定问题,以福州市某600t/d城市生活垃圾焚烧炉为研究对象在额定工况下进行数值模拟分析,借助全局敏感性分析方法Sobol研究了一次风占比、空气过量系数、烟气再循环率和负荷4个输入参数对出口NO_x浓度的敏感性,以此评估各参数对垃圾焚烧炉内燃烧的影响。结果表明,一次风占比和烟气再循环率的直接影响较为明显,而负荷与烟气再循环率的交互作用更为显著。在此基础上,探究烟气再循环耦合一次风占比对NO_x的减排影响,得出最佳工况为一次风占比65%,烟气再循环率为2.25%；进一步通过设定不同负荷工况,得出了最佳后墙二次风喷入角度随负荷变化的规律,本研究结果可为实际焚烧炉低氮燃烧提供参考。

In order to optimize the priority setting of waste incinerator parameters, a numerical simulation analysis was carried out under rated operating conditions with a 600t/d municipal waste incinerator in Fuzhou City as the research object. The sensitivity of four input parameters, namely the primary air percentage, air excess coefficient, flue gas recirculation rate and load, on the NOx concentration of exported nitrogen oxides was investigated using the Sobol global sensitivity analysis method Sobol. This was done to evaluate the impact of each parameter on the combustion process in the waste incinerator. The results demonstrate that the direct effects of primary air percentage and flue gas recirculation rate are more pronounced, while the interaction between load and flue gas recirculation rate is more significant. Based on these findings, the impact of flue gas recirculation in conjunction with primary air percentage on NOx reduction was examined, and the optimal operational parameters were identified as 65% primary air percentage and 2.25% flue gas recirculation. Furthermore, by setting different load conditions, the optimal back wall secondary air injection angle with load changes in the law was obtained. The results of this study can provide a reference for the low-NOx combustion in actual incinerators.

TK221

福建省科技计划项目（2022Y3008）